The expected delivery date on the first batch of pre-orders are expected to be on 16th or 17th November 2015.
It seems only the 64GB and 128GB model will be available in Singapore. And each of the model will be available in two colors, Graphite and Aluminium.
The pre-order price will be S$50 cheaper than the recommended retail price as shown in the table below:
It seems getting the 128GB model is more worth it as it is only S$100 more for double the capacity. In the future, when you trade in the phone, you will also fetch a higher price with a higher capacity.
Source: Huawei Singapore Facebook Page